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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '247146bd11abebb6a2903fdbdf3da2e195e31661bbe465ed39b6cc5f2844ef16' 
  AND token = 's2fZP/OwF9QGSxEKA3EjEgGThUSzP4JJjuBXictQ2IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}